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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Volume
-- Copyright : (c) 2011 Thomas Tuegel
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- A monitor for ALSA soundcards
--
-----------------------------------------------------------------------------
module Plugins.Monitors.Volume (runVolume, volumeConfig) where
import Control.Applicative ((<$>))
import Control.Monad ( join, liftM2, liftM3, mplus )
import Data.Traversable (sequenceA)
import Plugins.Monitors.Common
import Sound.ALSA.Mixer
import qualified Sound.ALSA.Exception as AE
import System.Console.GetOpt
volumeConfig :: IO MConfig
volumeConfig = mkMConfig "Vol: <volume>% <status>"
["volume", "volumebar", "dB","status"]
data VolumeOpts = VolumeOpts
{ onString :: String
, offString :: String
, onColor :: Maybe String
, offColor :: Maybe String
, highDbThresh :: Float
, lowDbThresh :: Float
}
defaultOpts :: VolumeOpts
defaultOpts = VolumeOpts
{ onString = "[on] "
, offString = "[off]"
, onColor = Just "green"
, offColor = Just "red"
, highDbThresh = -5.0
, lowDbThresh = -30.0
}
options :: [OptDescr (VolumeOpts -> VolumeOpts)]
options =
[ Option "O" ["on"] (ReqArg (\x o -> o { onString = x }) "") ""
, Option "o" ["off"] (ReqArg (\x o -> o { offString = x }) "") ""
, Option "" ["lowd"] (ReqArg (\x o -> o { lowDbThresh = read x }) "") ""
, Option "" ["highd"] (ReqArg (\x o -> o { highDbThresh = read x }) "") ""
, Option "C" ["onc"] (ReqArg (\x o -> o { onColor = Just x }) "") ""
, Option "c" ["offc"] (ReqArg (\x o -> o { offColor = Just x }) "") ""
]
parseOpts :: [String] -> IO VolumeOpts
parseOpts argv =
case getOpt Permute options argv of
(o, _, []) -> return $ foldr id defaultOpts o
(_, _, errs) -> ioError . userError $ concat errs
percent :: Integer -> Integer -> Integer -> Float
percent v' lo' hi' = (v - lo) / (hi - lo)
where v = fromIntegral v'
lo = fromIntegral lo'
hi = fromIntegral hi'
formatVol :: Integer -> Integer -> Integer -> Monitor String
formatVol lo hi v =
showPercentWithColors $ percent v lo hi
formatVolBar :: Integer -> Integer -> Integer -> Monitor String
formatVolBar lo hi v =
showPercentBar (100 * x) x where x = percent v lo hi
switchHelper :: VolumeOpts
-> (VolumeOpts -> Maybe String)
-> (VolumeOpts -> String)
-> Monitor String
switchHelper opts cHelp strHelp = return $
colorHelper (cHelp opts)
++ strHelp opts
++ maybe "" (const "</fc>") (cHelp opts)
formatSwitch :: VolumeOpts -> Bool -> Monitor String
formatSwitch opts True = switchHelper opts onColor onString
formatSwitch opts False = switchHelper opts offColor offString
colorHelper :: Maybe String -> String
colorHelper = maybe "" (\c -> "<fc=" ++ c ++ ">")
formatDb :: VolumeOpts -> Integer -> Monitor String
formatDb opts dbi = do
h <- getConfigValue highColor
m <- getConfigValue normalColor
l <- getConfigValue lowColor
d <- getConfigValue decDigits
let db = fromIntegral dbi / 100.0
digits = showDigits d db
startColor | db >= highDbThresh opts = colorHelper h
| db < lowDbThresh opts = colorHelper l
| otherwise = colorHelper m
stopColor | null startColor = ""
| otherwise = "</fc>"
return $ startColor ++ digits ++ stopColor
runVolume :: String -> String -> [String] -> Monitor String
runVolume mixerName controlName argv = do
opts <- io $ parseOpts argv
control <- io $ getControlByName mixerName controlName
(lo, hi) <- io . liftMaybe $ getRange <$> volumeControl control
val <- getVal $ volumeControl control
db <- getDB $ volumeControl control
sw <- getSw $ switchControl control
p <- liftMonitor $ liftM3 formatVol lo hi val
b <- liftMonitor $ liftM3 formatVolBar lo hi val
d <- getFormatDB opts db
s <- getFormatSwitch opts sw
parseTemplate [p, b, d, s]
where
volumeControl :: Maybe Control -> Maybe Volume
volumeControl c = join $
(playback . volume <$> c) `mplus` (common . volume <$> c)
switchControl :: Maybe Control -> Maybe Switch
switchControl c = join $
(playback . switch <$> c) `mplus` (common . switch <$> c)
liftMaybe :: Maybe (IO (a,b)) -> IO (Maybe a, Maybe b)
liftMaybe = fmap (liftM2 (,) (fmap fst) (fmap snd)) . sequenceA
liftMonitor :: Maybe (Monitor String) -> Monitor String
liftMonitor Nothing = return unavailable
liftMonitor (Just m) = m
getDB :: Maybe Volume -> Monitor (Maybe Integer)
getDB Nothing = return Nothing
getDB (Just v) = io $ AE.catch (getChannel FrontLeft $ dB v)
(const $ return $ Just 0)
getVal :: Maybe Volume -> Monitor (Maybe Integer)
getVal Nothing = return Nothing
getVal (Just v) = io $ getChannel FrontLeft $ value v
getSw :: Maybe Switch -> Monitor (Maybe Bool)
getSw Nothing = return Nothing
getSw (Just s) = io $ getChannel FrontLeft s
getFormatDB :: VolumeOpts -> Maybe Integer -> Monitor String
getFormatDB _ Nothing = return unavailable
getFormatDB opts (Just d) = formatDb opts d
getFormatSwitch :: VolumeOpts -> Maybe Bool -> Monitor String
getFormatSwitch _ Nothing = return unavailable
getFormatSwitch opts (Just sw) = formatSwitch opts sw
unavailable = "N/A"
|
